How to use input from first operation as variable in second operation

[abrown07]

How do I get the program to take the "Population " calculated from the first time and use it as the "initial" variable for the next calculation. And for it to continue to do this for generations 2 on each time taking the previously calculated Population and using it as the variable "initial" for the next calculation. With what I have right now when I run the program it just kind of... pauses after I give all the inputs.

#include<stdio.h>
#include<math.h>

int main(void)

{

  double Population,capacity,initial;
  int generations;
  float result,growth;
  
  
   printf("Please give the carrying capacity of the environment: ");
   scanf("%lf", &capacity);
   
   printf("Please give the intrisic growth rate: ");
   scanf("%f", &growth);
   
   result=exp (growth);
   
   
   printf("Please give the inital population of the species: ");
   scanf("%lf", &initial);
   
   printf("Please indicate the number of generations: ");
   scanf("%d", &generations);
   
   Population=initial*result*(1-(initial/capacity));
 
    for(generations = 2; generations <=80; initial= Population)
   
       Population=initial*result*(1-(initial/capacity));
   
   printf("The expected population at the next generation is: %.6f\n",Population);
   return(0);
   
}

[whodgson]

Convert population into a function
//then
population+=pop ulation();
BTW you should place you code in between code tags to make it easier for others to read.

[jkmyoung]

The problem was that in your for loop you had:
Population=init ial*result*(1-(initial/capacity));
You're using the initial variable over and over. You wanted:
Population=Popu lation*result*( 1-(initial/capacity)); or
Population*=res ult*(1-(initial/capacity));